E615 🟡 Repair Required
Navien Error Code E615: PCB Communication Failure
⚠️ Your Navien boiler has a communication issue, causing it to shut down. It's safe to troubleshoot, but call a professional if needed.
How to Fix Navien Code E615
- Step 1: Check if the boiler has power. Look for the 'ON/OFF' switch and ensure it's in the 'ON' position.
- Step 2: Try a power reset. Turn off the boiler at the switch, wait 30 seconds, then turn it back on.
- Step 3: If the error persists, call a professional HVAC technician. Do not attempt to open the boiler or tamper with internal components.
What Does Navien Error Code E615 Mean?
The E615 error on your Navien boiler indicates a PCB (Printed Circuit Board) communication failure. This means that the control board can't communicate properly with other components, causing your boiler to shut down. This issue is typically not caused by a faulty PCB itself, but rather a problem with the communication lines or other connected components.
Common Causes of Navien Code E615
- Wiring issues or damaged communication lines
- Faulty sensors or other connected components
- Software glitch causing temporary communication failure
Applicable Navien Models
Source Documentation
This error code is documented in 6 official Navien technical manuals.
NFB-H Installation & Operation ManualPage 116
ReasonAbnormal Memory
ActionCheck PCB connections.
Navien NCB-H Installation & Operation ManualPage 130
ReasonAbnormal Memory
ActionContact technical support at 1-800-519-8794.
Navien NFB-H Installation & Operation ManualPage 116
ReasonAbnormal Memory
ActionCheck PCB connections.
Navien NFC-H Installation & Operation ManualPage 128
ReasonAbnormal operation: input and memory
ActionManual RESET Auto RESET Alarm
Navien NHB-H Installation & Operation ManualPage 119
ReasonAbnormal Memory
ActionCheck PCB connections.
Navien NPF Installation & Operation ManualPage 128
ReasonAbnormal overheat controller feedback
Need a Pro to Fix Navien Code E615?
A licensed HVAC technician can diagnose and fix this issue quickly.
Find a Licensed Tech Near You →Replacement Parts for Navien Tankless Water Heater Code E615
Communication Line Harness OEM: 900-1100-0000
PCB (Printed Circuit Board)